松辽盆地北部生物气特征及其成因

目前生物气资源占世界天然气资源总量的10%～20%，中国已发现了一些生物气田。文章统计了松辽盆地北部生物气的主要分布地区和层位，针对主要分布生物气的3个地区进行地化特征对比，分析其成因类型。研究结果表明：松辽盆地北部生物气主要分布在西部斜坡区的萨尔图油层和高台子油层、长垣-古龙地区的黑帝庙油层和朝长-王府的葡萄花油层以及扶余油层；各地区生物气组分和同位素特征有各自的特点；其成因主要有3种：①传统的甲烷生物气；②原油菌解生物气；③亚生物气。

CHARACTERISTICS AND ORIGIN OF BIOGAS IN THE NORTH SONGLIAO BASIN

Biogas resources account for 10% to 20% of the total gas resources in the world at present. Some biogas fields have been discovered in China. The main biogas-bearing areas and horizons in the North Songliao Basin are counted. The geochemical behaviors of 3 main biogas-bearing areas are correlated and the genetic types of biogas are analyzed. Biogas in the study area are mainly distributed in Saertu and Gaotaizi oil reservoirs in the western slope zone, Heidimiao oil reservoir in Changyuan-Gulong area, and Putaohua and Fuyu oil reservoirs in Chaochang-Wangfu area. Biogas in each area has its own components and isotopic features and can be grouped into 3 main genetic types, including conventional methane biogas, biogas from bacterial decomposition of crude oil and biothermal-catalytic gas in transitional zone.